Low-solidifying-point foaming agent for oilfield operation

Abstract

The invention relates to a low-solidifying-point foaming agent for oilfield operation. The foaming agent is compounded from polyoxyethylene fatty alcohol sodium sulfate (ASE), cocamidopropyl betaine (CAB), an anionic polymer, glycerol and water. The synergistic action of the AES and CAB increases the foam yield. The anionic polymer added into the compounded system enhances the strength of the foam liquid film, thereby further enhancing the foam stability. The added glycerol lowers the solidifying point of the system to -15 DEG C below, and does not influence the stability of the foaming agent. In the preferable scheme, the low-solidifying-point foaming agent for oilfield operation is composed of the following components in percentage by mass: 24.5% of ASE, 1.4% of CAB, 0.35% of anionic polymer, 30% of glycerol and 43.75% of water. The foaming agent has the advantages of favorable foaming property, high stability, simple preparation process and the like, is convenient to use, and can be well applied in field and especially in a low-temperature environment.

Description

technical field [0001] The invention relates to a foaming agent for oilfield operations, in particular to a foaming agent for operations that can still maintain good flow in a low-temperature environment. Background technique [0002] During the long-term operation of oilfield pipelines, there will be phenomena such as sand production, wax precipitation, scaling, etc. that affect the production of oil and gas fields. In order to ensure the normal production of oilfields, it is necessary to wash them. Foam well washing technology has been widely used due to its advantages of good effect and small usage. This technology requires the use of a foaming agent; the oil field foaming agent is dissolved in water and disturbed to generate a large number of bubbles, and injected into the part to be washed for cleaning. Due to the large shear force and high viscosity of the foam fluid, it has good dispersion and emulsification It has a good peeling and cleaning effect on the paraffin a...

AI Technical Summary

Problems solved by technology

[0003] At present, there are many types of foaming agents for oilfield operations on the market, with good performance, but the freezing point is relatively high. For example, the commonly used UT8-2 has a freezing point of about -1°C. It solidifies rapidly in a low temperature environment, and its fluidity drops sharply. The loss of fluidity makes the foaming agent unable to be used normally, which in turn makes the foam cleaning effect worse. At the same time, the solidified foaming agent will cause inconvenience in transportation, and it is easy to leak and cause environmental pollution.

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